California's gun laws are among the nation's strictest, but a looming decision in a federal lawsuit could effectively ban handguns altogether in the Golden State, according to plaintiffs who want a judge to toss out a state law requiring all new handguns to be equipped with technology that "stamps" each shell casing with a traceable mark. The problem with the “microstamping” law, which was signed into law by then-Gov. Arnold Schwarzenegger in 2007 but only took effect in 2013, is that it relies on an unworkable technology, according to gun manufacturers and attorneys for the Second Amendment Foundation and Calguns...